Let the turtles free

When you need to go poo!

Denise: It's kind of like right now. I have to go let the turtles free. (Runs to the bathroom)

let yourself off

To nut; an action you can do late at night to calm yourself down to sleep! let yourself off

I tell my friends when they can’t sleep to let themselves off by saying, “just let yourself off and you’ll fall fast asleep”

Let the battles begin

Smash fans and Final Fantasy fans alike have heard this song way too much.

I don't think this needs an example. Just let the battles begin

let's ft boo

Let's not

You : Let's FT boo

Her: let's not :)

Let Down Blizzard

When you send a friend to get blizzards from Dairy Queen and they are out of your flavor, so the friend chooses a flavor for you.

Rob: "Hey, they were out of caramel cheesecake, so I got you Oreo."
Lee: "Damn, a let down blizzard."

Let the Zoo Out

Present Participle: Letting the zoo out
When you break up with a girl and she goes ape shit on you for breaking up with her.

I was dating this girl and now I like her best friend's friend, I had to let the zoo out.

Let’s take a look in there

When your vagina is discharging weird stuff and you have to usually get an phone camera or a mirror and check if everything is alright down there. Used by OB/GYNs rarely.

*using restroom*
Mind: Wait why the hell and I discharging brown stuff?
*finishes using restroom*
*Grabs mirror*
Let’s take a look in there…